{"id":20473,"date":"2025-02-04T11:58:13","date_gmt":"2025-02-04T11:58:13","guid":{"rendered":"http:\/\/141.23.68.248\/wp\/?page_id=20473"},"modified":"2025-02-11T02:12:18","modified_gmt":"2025-02-11T02:12:18","slug":"system-3-building-facilities-rooftop-of-water-tank","status":"publish","type":"page","link":"http:\/\/141.23.68.248\/wp\/?page_id=20473","title":{"rendered":"System 3: Building Facilities \u2013 Rooftop of Water Tank"},"content":{"rendered":"

Steel Fluid Storage Tank Roof Life Cycle Assessment<\/strong><\/p>\n

\u27a2<\/strong> SYSTEM:<\/strong><\/p>\n

The\u00a0steel fluid storage tank<\/strong>\u00a0is a crucial infrastructure component in industrial and municipal applications, ensuring the safe storage of liquids such as water, oil, and chemicals. The\u00a0roof subsystem<\/strong>\u00a0plays a vital role in\u00a0protecting stored fluids from environmental exposure<\/strong>, preventing contamination, and maintaining structural integrity. The\u00a0primary challenge<\/strong>\u00a0associated with the roof system is\u00a0corrosion and wear over time<\/strong>, requiring\u00a0strategic material selection and maintenance planning<\/strong>\u00a0to optimize its lifecycle performance.<\/p>\n

\u27a2<\/strong> SUB-SYSTEM:<\/strong><\/p>\n

The\u00a0roof subsystem<\/strong>\u00a0of the steel fluid storage tank is analyzed in this study. It is responsible for:
\n\u2714\u00a0Shielding the stored fluid from environmental exposure (e.g., rain, UV radiation, pollutants).<\/strong>
\n\u2714\u00a0Preventing evaporation losses and maintaining the tank’s structural strength.<\/strong>
\n\u2714\u00a0Minimizing corrosion-related failures through appropriate coatings and maintenance interventions.<\/strong><\/p>\n

The\u00a0roof subsystem<\/strong>\u00a0consists of\u00a0steel as the primary material<\/strong>, with different coatings or composite elements incorporated depending on the selected\u00a0design option<\/strong>. Given its\u00a0direct impact on operational efficiency and maintenance costs<\/strong>, selecting an optimal\u00a0roof design<\/strong>\u00a0is crucial.<\/p>\n

\u27a2<\/strong> GOAL AND SCOPE ASSESSMENT:<\/strong><\/p>\n

The\u00a0goal of this project<\/strong>\u00a0is to conduct a\u00a0life-cycle assessment (LCA)<\/strong>\u00a0to determine the\u00a0energy consumption, CO\u2082 emissions, NOx emissions, and SO\u2082 emissions<\/strong>\u00a0associated with different\u00a0roof designs<\/strong>\u00a0for a\u00a050-year lifespan<\/strong>. The\u00a0assessment scope includes<\/strong>:<\/p>\n

\u2714\u00a0Material extraction and production<\/strong>\u00a0(e.g., steel manufacturing, coating applications).
\n\u2714\u00a0Installation and initial construction<\/strong>\u00a0(energy\/material inputs for assembly).
\n\u2714\u00a0Operational phase and maintenance interventions<\/strong>\u00a0(anti-corrosion coatings, repairs).
\n\u2714\u00a0End-of-life considerations<\/strong>\u00a0(dismantling, recycling, or disposal).<\/p>\n

The\u00a0boundary of the LCA<\/strong>\u00a0is\u00a0cradle-to-grave<\/strong>, ensuring that all relevant life-cycle stages are considered.<\/p>\n

\u27a2<\/strong> DESIGN OPTIONS:<\/strong><\/p>\n

The study evaluates four distinct\u00a0roof design options<\/strong>, each with unique\u00a0structural, environmental, and economic implications<\/strong>:<\/p>\n\n\n\n\n\n\n\n\n
Design Option<\/strong><\/td>\nDescription<\/strong><\/td>\nMaterial<\/strong><\/td>\nAdvantages<\/strong><\/td>\nDisadvantages<\/strong><\/td>\n<\/tr>\n<\/thead>\n
Standard Cone Roof<\/strong><\/td>\nTraditional, cone-shaped roof for efficient rainwater runoff.<\/td>\nSteel with anti-corrosion coating<\/strong><\/td>\nCost-effective, low maintenance.<\/td>\nHigh energy consumption & emissions.<\/td>\n<\/tr>\n
Dome Roof<\/strong><\/td>\nHemispherical roof with uniform stress distribution.<\/td>\nStructural steel with enhanced protection<\/strong><\/td>\nHigh strength-to-weight ratio.<\/td>\nHigh cost due to complex fabrication.<\/td>\n<\/tr>\n
Composite Roof<\/strong><\/td>\nHybrid roof combining steel with composite materials.<\/td>\nSteel base with fiberglass\/polymer overlays<\/strong><\/td>\nLightweight, insulated, corrosion-resistant.<\/td>\nRequires specialized maintenance.<\/td>\n<\/tr>\n
Tensioned Membrane Roof<\/strong><\/td>\nLightweight membrane stretched over a steel frame.<\/td>\nSteel frame with tensioned polymer fabric<\/strong><\/td>\nLow energy consumption, cost-effective.<\/td>\nLess durable in harsh conditions.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Each design’s\u00a0energy and emissions profile<\/strong>\u00a0was assessed to determine the most\u00a0sustainable and cost-effective alternative<\/strong>.<\/p>\n

\u27a2<\/strong> LIFE CYCLE INVENTORY:<\/strong><\/p>\n

The\u00a0life-cycle inventory (LCI)<\/strong>\u00a0quantifies the\u00a0environmental impact of each roof design<\/strong>, including\u00a0energy consumption and emissions<\/strong>. The results are summarized below:<\/p>\n\n\n\n\n\n\n\n\n
Design Option<\/strong><\/td>\nEnergy (MJ)<\/strong><\/td>\nCO\u2082 (kg)<\/strong><\/td>\nNOx (kg)<\/strong><\/td>\nSO\u2082 (kg)<\/strong><\/td>\n<\/tr>\n<\/thead>\n
Standard Cone Roof<\/strong><\/td>\n45<\/td>\n450<\/td>\n45<\/td>\n22.5<\/td>\n<\/tr>\n
Dome Roof<\/strong><\/td>\n21<\/td>\n210<\/td>\n21<\/td>\n9.48<\/td>\n<\/tr>\n
Composite Roof<\/strong><\/td>\n23.04<\/td>\n230.4<\/td>\n23.04<\/td>\n10.72<\/td>\n<\/tr>\n
Tensioned Membrane Roof<\/strong><\/td>\n2.52<\/td>\n25.2<\/td>\n2.52<\/td>\n1.27<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u2714\u00a0Tensioned Membrane Roof (Option 4) is the most sustainable<\/strong>, having the\u00a0lowest energy demand and emissions<\/strong>.
\n\u2714\u00a0Standard Cone Roof (Option 1) has the highest emissions and energy consumption<\/strong>, making it the least eco-friendly option.<\/p>\n

\u27a2<\/strong> LIFE-CYCLE TIMELINE:<\/strong><\/p>\n

The\u00a0maintenance schedule<\/strong>\u00a0for each roof type over\u00a050 years<\/strong>\u00a0was analyzed, considering:
\n\u2714\u00a0Routine inspections<\/strong>\u00a0(every 5 years).
\n\u2714\u00a0Anti-corrosion coatings<\/strong>\u00a0(every 10 years).
\n\u2714\u00a0Partial repairs<\/strong>\u00a0(every 15 years).
\n\u2714\u00a0Major overhauls<\/strong>\u00a0(every 30 years, except for Tensioned Membrane Roof).<\/p>\n

\"image6\"<\/a><\/p>\n

Findings from Maintenance Timeline Analysis:<\/strong><\/p>\n

\u2714\u00a0Standard Cone Roof:<\/strong>\u00a0Requires\u00a0frequent maintenance<\/strong>\u00a0due to\u00a0high corrosion susceptibility<\/strong>.
\n\u2714\u00a0Dome Roof:<\/strong>\u00a0Requires\u00a0fewer interventions<\/strong>, offering a\u00a0balance between cost and durability<\/strong>.
\n\u2714\u00a0Composite Roof:<\/strong>\u00a0Moderate maintenance needs<\/strong>, but specialized repair procedures increase costs.
\n\u2714\u00a0Tensioned Membrane Roof:<\/strong>\u00a0Least maintenance required<\/strong>, with occasional\u00a0membrane tension adjustments<\/strong>.<\/p>\n

\u27a2<\/strong> LIFE-CYCLE INVENTORY ANALYSIS:<\/strong><\/p>\n

Using\u00a0life-cycle inventory data<\/strong>, the environmental and economic impact of each\u00a0roof design<\/strong>\u00a0was computed. The\u00a0analysis confirmed<\/strong>\u00a0that:<\/p>\n

\u2714\u00a0The Tensioned Membrane Roof (Option 4) has the lowest environmental footprint<\/strong>\u00a0due to minimal\u00a0material usage and maintenance needs<\/strong>.
\n\u2714\u00a0The Standard Cone Roof (Option 1) has the highest emissions and energy demand<\/strong>, making it the\u00a0least sustainable choice<\/strong>.
\n\u2714\u00a0Dome and Composite Roofs<\/strong>\u00a0present\u00a0balanced trade-offs<\/strong>, offering\u00a0better durability at higher initial costs<\/strong>.<\/p>\n

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\"image1\"<\/a><\/p>\n

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\u27a2<\/strong> MULTI-CRITERIA DECISION ANALYSIS (MCDA):<\/strong><\/p>\n

The\u00a0Analytic Hierarchy Process (AHP)<\/strong>\u00a0was used to rank roof designs based on\u00a0energy efficiency, CO\u2082 emissions, NOx emissions, and SO\u2082 emissions<\/strong>.<\/p>\n

Ranking Based on AHP:<\/strong><\/p>\n

1\ufe0f\u20e3\u00a0Standard Cone Roof<\/strong>\u00a0\u2013\u00a0Structurally robust<\/strong>\u00a0but\u00a0high energy and emissions<\/strong>.
\n2\ufe0f\u20e3\u00a0Dome Roof<\/strong>\u00a0\u2013 Balanced performance with\u00a0moderate cost and emissions<\/strong>.
\n3\ufe0f\u20e3\u00a0Composite Roof<\/strong>\u00a0\u2013\u00a0Lightweight and insulated<\/strong>, but maintenance-intensive.
\n4\ufe0f\u20e3\u00a0Tensioned Membrane Roof<\/strong>\u00a0\u2013\u00a0Most sustainable and cost-efficient<\/strong>\u00a0option.<\/p>\n

\u2714 The\u00a0Tensioned Membrane Roof ranks highest<\/strong>\u00a0in terms of\u00a0environmental sustainability<\/strong>\u00a0and\u00a0lifecycle cost efficiency<\/strong>.<\/p>\n

\"image11\"<\/a><\/p>\n

\u27a2<\/strong> CONCLUSION:<\/strong><\/p>\n

Based on the\u00a0life-cycle assessment (LCA) and multi-criteria decision analysis (MCDA),<\/strong>\u00a0the following recommendations are made:<\/p>\n

\u2714\u00a0For maximum sustainability and cost efficiency:\u00a0Tensioned Membrane Roof (Option 4)\u00a0is the best choice due to\u00a0low emissions, minimal maintenance, and low energy consumption.
\n\u2714\u00a0For structural robustness and durability:\u00a0Standard Cone Roof (Option 1)\u00a0is ideal but has\u00a0high environmental and maintenance costs.
\n\u2714\u00a0For a balanced trade-off:\u00a0Dome Roof (Option 2) or Composite Roof (Option 3)\u00a0provide good durability at\u00a0moderate environmental and financial costs.<\/h5>\n

Final Insights:<\/strong><\/h4>\n